Tonkotsu Kazan VOLCANO Ramen is a ramen shop in Novena Square 2 in Singapore that serves Japanese-style tonkotsu ramen. The menu includes shio ramen and karamiso ramen, and boiled eggs are free. On a weekday around 8:30 p.m. it was possible to walk in right away, while on a Saturday lunchtime there was a short wait for a table. The tonkotsu broth is not heavy on pork smell or oil, and the saltiness is not strong.